Quantum key distribution over<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>25</mml:mn><mml:mspace width="0.3em" /><mml:mi>km</mml:mi></mml:mrow></mml:math>with an all-fiber continuous-variable system

Lodewyck, Jérôme; Bloch, Matthieu R.; García−Patrón, Raúl; Fossier, Simon; Karpov, Evgueni; Diamanti, Eleni; Debuisschert, Thierry; Cerf, Nicolas J.; Tualle-Brouri, Rosa; McLaughlin, S.W.; Grangier, Philippe

doi:10.1103/physreva.76.042305

Cited by 471 publications

(380 citation statements)

References 35 publications

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“…The security of commercially available continuous variable (CV) systems relies on security proofs under the assumption of collective attacks [12]. Only recently a security proof for most general coherent attacks with a finite number of samples providing composable security was published [13].…”

Section: Introductionmentioning

confidence: 99%

Stable control of 10 dB two-mode squeezed vacuum states of light

Eberle¹,

Händchen²,

Schnabel³

2013

Opt. Express

133

103

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Continuous variable entanglement is a fundamental resource for many quantum information tasks. Important protocols like superactivation of zero-capacity channels and finite-size quantum cryptography that provides security against most general attacks, require about 10 dB two-mode squeezing. Additionally, stable phase control mechanisms are necessary but are difficult to achieve because the total amount of optical loss to the entangled beams needs to be small. Here, we experimentally demonstrate a control scheme for two-mode squeezed vacuum states at the telecommunication wavelength of 1550 nm. Our states exhibited an Einstein-Podolsky-Rosen covariance product of 0.0309 ± 0.0002, where 1 is the critical value, and a Duan inseparability value of 0.360 ± 0.001, where 4 is the critical value. The latter corresponds to 10.45 ± 0.01 dB which reflects the average non-classical noise suppression of the two squeezed vacuum states used to generate the entanglement. With the results of this work demanding quantum information protocols will become feasible.

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Section: Introductionmentioning

confidence: 99%

Stable control of 10 dB two-mode squeezed vacuum states of light

Eberle¹,

Händchen²,

Schnabel³

2013

Opt. Express

133

103

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“…There are currently reported continuous variable QKD experiments implemented in optical fiber [18][19][20] and others that simulate a lossy channel with a beamsplitter [21,22]. Compared to the previous work, this is the first experiment to use discrete signaling over optical fiber.…”

Section: Introductionmentioning

confidence: 95%

A 24 km fiber-based discretely signaled continuous variable quantum key distribution system

Dinh¹,

Zhang²,

Voss³

2009

Opt. Express

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Abstract:We report a continuous variable key distribution system that achieves a final secure key rate of 3.45 kb/sec over a distance of 24.2 km of optical fiber. The protocol uses discrete signaling and post-selection to improve reconciliation speed and quantifies security by means of quantum state tomography. Polarization multiplexing and a frequency translation scheme permit transmission of a continuous wave local oscillator and suppression of noise from guided acoustic wave Brillouin scattering by more than 27 dB.

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“…A benefit of this optical integration is stabilization and miniaturization of quantum circuits and attainment of a high degree of spatial mode matching, which is essential for both classical and quantum interference. Fiber optics is also important for guiding light beams and stabilizing an optical system, and then applied for various CV applications [25][26][27][28][29].…”

Section: Introductionmentioning

confidence: 99%

On-chip continuous-variable quantum entanglement

Masada

Furusawa

2016

Nanophotonics

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Entanglement is an essential feature of quantum theory and the core of the majority of quantum information science and technologies. Quantum computing is one of the most important fruits of quantum entanglement and requires not only a bipartite entangled state but also more complicated multipartite entanglement. In previous experimental works to demonstrate various entanglement-based quantum information processing, light has been extensively used. Experiments utilizing such a complicated state need highly complex optical circuits to propagate optical beams and a high level of spatial interference between different light beams to generate quantum entanglement or to efficiently perform balanced homodyne measurement. Current experiments have been performed in conventional free-space optics with large numbers of optical components and a relatively largesized optical setup. Therefore, they are limited in stability and scalability. Integrated photonics offer new tools and additional capabilities for manipulating light in quantum information technology. Owing to integrated waveguide circuits, it is possible to stabilize and miniaturize complex optical circuits and achieve high interference of light beams. The integrated circuits have been firstly developed for discrete-variable systems and then applied to continuous-variable systems. In this article, we review the currently developed scheme for generation and verification of continuous-variable quantum entanglement such as Einstein-Podolsky-Rosen beams using a photonic chip where waveguide circuits are integrated. This includes balanced homodyne measurement of a squeezed state of light. As a simple example, we also review an experiment for generating discrete-variable quantum entanglement using integrated waveguide circuits.

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Quantum key distribution over25kmwith an all-fiber continuous-variable system

Cited by 471 publications

References 35 publications

Stable control of 10 dB two-mode squeezed vacuum states of light

Stable control of 10 dB two-mode squeezed vacuum states of light

A 24 km fiber-based discretely signaled continuous variable quantum key distribution system

On-chip continuous-variable quantum entanglement

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